Visual Basic

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Visual Basic

• An introduction
• By
• Tony Wilson

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Visual BASIC Environment
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Visual BASIC Environment
Control tool bar with default controls
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Visual BASIC Environment
Control tool bar with default controls
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Visual BASIC Environment
Form worksheet displaying the program screen
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Visual BASIC Environment
Directory of major project components
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Visual BASIC Environment
Properties window
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Visual BASIC Environment
Dropdown list of objects (whose properties can be
set).
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Visual BASIC Environment
Explanation of highlighted property
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Visual BASIC Environment
Diagram of where the program will appear on the
screen.
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Visual BASIC Environment
Code window showing code behind the objects
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Visual BASIC Environment
Dropdown list of objects
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Visual BASIC Environment
Dropdown list of events the object can respond to.
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Visual BASIC Controls
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Visual BASIC Controls Labeled
Pointer ? Label? Frame? CheckBox? ComboBox? HScrol
lBar? Timer? DirListBox? Shape? Image? OLE?
? PictureBox ? TextBox ? CommandButton ?
OptionButton ? ListBox ? VScrollBar ?
DriveListBox ? FileListBox ? Line ? Data
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Visual BASIC Controls Name Prefixes
Pointer ? lbl? fra? chk? cbo? hsb? tmr? dir? shp?
img? ole?
? pic ? txt ? cmd ? opt ? lst ? vsb ? drv ? fil ?
lin ? dat
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Visual BASIC Controls Name Prefixes
Pointer ? lbl? fra? chk? cbo? hsb? tmr? dir? shp?
img? ole?
? pic ? txt ? cmd ? opt ? lst ? vsb ? drv ? fil ?
lin ? dat
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Visual BASIC Controls Pointer

• Used to select things
• Click
• Drag
• Resize
• Etcetera

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Visual BASIC Controls Label

• Puts words on the screen
• Does not interact with user
• Can be made invisible or changed by the program

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Visual BASIC Controls Frame

• Used to group other objects
• Logically or just visually
• Need not be visible
• Draw the frame, then draw the objects in it.
• Especially useful with Option (Radio) buttons

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Visual BASIC Controls CheckBox

• Indicates selection
• Need not be part of a group
• Built-in caption mechanism
• 3 states
• Checked
• Not checked
• Grayed

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Visual BASIC Controls ComboBox

• Varieties of lists
• Visible/pulldown
• Can type in/must select from list

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Visual BASIC Controls Horizontal Scroll Bar

• Lets user set a value
• GUI view is horizontal

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Visual BASIC Controls Horizontal Scroll Bar

• Lets user set a value
• GUI view is Vertical

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Visual BASIC Controls Timer

• Not visible at runtime
• Triggers a Timer Event at a programmed interval